Abstract: In a portable telephone set in which at least a part of telephone set is brought into an open state for talking as in a folding-up type portable telephone set, in order to eliminate complicated dialling operation to a predetermined subscriber, dial number information of the subscribers are previously stored in memory. When an automatic dial function is selected and the dial number information of the subscriber is selected, then on the open state of the telephone set, the dial number information of the subscribers, which is read from the memory, is automatically fed to the telephone network.

Abstract: In a radio telephone set for digital communication, tone sound is generated under a state where digital data is received. For this purpose, a tone generator is provided to make the tone sound. The tone generator is actuated when a received digital signal is for digital data communication.